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A138466 a(1)=1, then for n>=2 a(n)=n-floor((1/2)*a(a(n-1))). 1
1, 2, 2, 3, 4, 5, 5, 6, 7, 8, 8, 9, 10, 10, 11, 12, 13, 13, 14, 15, 16, 16, 17, 18, 19, 19, 20, 21, 21, 22, 23, 24, 24, 25, 26, 27, 27, 28, 29, 30, 30, 31, 32, 32, 33, 34, 35, 35, 36, 37, 38, 38, 39, 40, 40, 41, 42, 43, 43, 44, 45, 46, 46, 47, 48, 49, 49, 50, 51, 51, 52, 53, 54 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..73.

FORMULA

For n>=1, a(n)=floor((sqrt(3)-1)*(n+1))

PROG

(PARI) a(n)=floor((sqrt(3)-1)*(n+1))

CROSSREFS

Sequence in context: A210357 A057359 A076538 * A247784 A249243 A066530

Adjacent sequences:  A138463 A138464 A138465 * A138467 A138468 A138469

KEYWORD

nonn

AUTHOR

Benoit Cloitre, May 09 2008

STATUS

approved

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Last modified October 20 07:17 EDT 2018. Contains 316378 sequences. (Running on oeis4.)